Prius (2010-12) :: Loud Clunk On Start Up After Releasing Brakes
Oct 1, 2012
I have a 2010 prius 2;
This morning after starting the car and releasing the brakes I heard loud clunking sound (seemed like a belt ?) Turned the car off. tried it again exact same thing, turned if off .. opened the hood to see if I can tell where this was coming from.. started the car and the clunking came for <1 sec and went away, car drove fine brakes worked fine..
I read something regarding temp changes we have had some change but not a drastic change, and the car was driven over the weekend.
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My R has been giving me some trouble lately. First I had some issues, I thought were clutch related.
-A loud clunk when releasing clutch pedal (only when engine running) and sometimes when depressing it too.
-Randomly changing clutch biting point when driving hard. So e.g. when revving through 1st and 2nd gear the clutch would bite much lower than usual. (This was so weird.)
-Whistling sound when changing from 1st to 2nd gear.
Replaced the clutch, flywheel, pressure plate and the TOB and bled the system several times. Also new solid DLI motor mounts and new oem dogbone mount.
There was some side-to-side play on input shaft that I was told is not a big deal. Also this gearbox has always been much louder than other cars Ive driven.
Now that weird changing clutch biting point is gone but other issues are still there. And now, because of the lightweight smf and the motor mounts the gears shatter and whine so much more on low revs and during engine braking. I know 02m s tend to do that but its so loud I am a bit worried.
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Initially when I start driving, the brakes work just find. But it seems as I use the brakes, the front brakes build up pressure and slowly start to lock up. They don't lock up completely, but they do cause a significant amount of drag. The rotor, calipers, rubber hoses and master cylinder are all very new. I'm thinking maybe the issue is with the master cylinder and am considering going to get one along with a brake booster(since it doesn't have one currently).
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I just had the left front strut replaced by an independent shop. Afterwards they noticed that pressing the brakes after backing up produces a single 'clunk' sound from the front. Not sure if it's from the left or right. Also not sure if it was doing this before the repair and didn't notice, or it just started. It only happens once, although I haven't tried backing up twice in a row.
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I get a clunk noise when stepping on and releasing the brakes occasionally but not always. This occurs even with the engine off and the vehicle stationary. I also hear some other noise like some sort of vacuum servo thing is happening.
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When I press and hold the brake and lightly release the pressure. The brakes would make this loud squeal. This happens when the car on or off. Just found out today that if I have to stop really suddenly, it makes the same noise. I have an rx450h w 42k miles. Any thought?
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Today I stopped at the post office to check my mail. I put the car in park and didn't shut off the engine - this is what I always do. When I returned a few moments later the car would not go into reverse (this was after releasing the parking brake) and the traction control symbol came on. The car would go into drive but that didn't work much as I was up against a hill (or almost against it). Shutting the car off and turning it on again solved the problem. The parking space was badly potholed; I'm assuming I had less than full contact on one wheel which caused the traction control to kick in which prevented reverse from engaging. And to be clear - it's not that it went into reverse but didn't go anywhere; reverse simply wouldn't engage (I did not try neutral),
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In the last couple of months I have noticed my '10 Prius III begins to roll forward or backwards about a foot depending upon which drive mode I select without releasing the brake. So here's the normal scenario I get in the car have my foot on the brake, turn it on wait for the ready beep/light, my foot has never left the brake or lessened pressure but not so much as to trigger the hill assist, I shift into D to go forward but say a car is coming and I don't want to go yet my car moves about a foot forward and I feel the brake pump up and then resist my foot. The same thing happens if I put it in R she rolls back a foot and stops. I don't recall noticing it before the great ECU update but I also can't say it didn't happen before the update was accomplished.
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My 2012 Elantra with 10,000 km sounded like the rear suspension was bottoming out with a loud clunk whenever I went over a bad bump or heave in the road. It was the right rear shock, which was replaced under warranty. The car handled well so it wasn't as if the damping had disappeared. About 500 km later the left rear shock had to be replaced under warranty as the loud clunking as if the suspension was bottoming out returned. I'm not sure of the shock manufacturer Hyundai is using, but they obviously had/have a quality control problem or the shocks just aren't up to the job. I live in the country and drive a lot of secondary roads, but have never had shocks go like this before. Something in the internal hydraulic value circuit is going wrong.
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After stepping over gas pedal revving up, when I release the gas pedal I can hear the engine revving up some more instead of slowing down.
When I release the pedal, the engine is still making the noise as if I am stepping on the gas harder for about 3 seconds. when this happened, EV mode will be always not available, and gasoline consumption is increased. Getting lower MPG.
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Just picked up a new 2014 rx fsport and 75% of the time I release the e-brake it has a loud clunk as if metal smashing metal. I tried releasing it really slow and it still does the same. The vehicle is parked on flat pavement. It is not a low click noise that I am used to but a loud clunk.
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We have had a few mornings (in garage) where it would seem to not really id say a knock but maybe a clicking sound and it would quit right away. This morning that did not happen so i shut the car off and checked oil it was low.
Got under the car and can not see any leaking no oil on ground. So i had a QT i put in and that seems to quiet it after a few seconds.
I called local TOY dealer and they said its common for 2010 to use some oil and not much they can do. I thought what is a little it was at the end of the dipstick.
They said they can only fill it up and then have me come back in 1400 miles and see how much is used.
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I was having some issues with rattling sounds from my brand new (less than 100 miles) Prius C2--see my thread here.
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We have a 2009 GLS AWD 3.3l and recently discovered that the parking brake was not fully releasing. We watch our mileage quite closely with the obc and it wasn't seeming quite right. A quick check of the rear parking brake drums showed that they were hot..as in not red hot but too hot to touch. The cure seems to be to work the parking brake pedal up and down fast and many times to 'free up' the mechanisms....this we now do after each time we use that brake. Sadly it is necessary to use it from time to time or like all parking brakes, it would become dysfunctional. Just a tip for those who may wonder why their good mileage suddenly went bad.
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When I release it then start in reverse often the car doesn't move then there is a loud sound from the right rear tire. If I don't engage the brake it reverse fine.I don't know where to start with this. I assume there is a cable going back to the wheel cylinders. Perhaps binding up somehow.
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I have a 2000 X 5.4... There is a loud roaring noise when releasing gas pedal or stopped (doesn't matter whether its in park or drive)...noise stops when giving gas...the noise is almost like a bull horn...there are no engine lights on so can't get a code...
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I have put on over 45000 miles already on my 07 SX4 and love this car. I am getting a brake light coming on at various times after releasing the brakes and accelerating. It goes out usually after I stop accelerating or hitting the brakes. It does not come back on after driving about 20 miles.
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It's a UK VW Passat year 2000 with 1.8i longitudinal engine layout. Car has ABS
I discovered that the brakes are not releasing quickly after application. Examples where this has been noticed:
When braking and accelerating at the same time to dry brakes after puddles. Noticeable lack of power to re-accelerate when you release the brake pedal, presumably due to continued braking. Noticeable continuation of braking when trailbraking into a corner (ok sometimes I'm a bit of a racer in a family car).
What concerns me is when the snow, ice or heavy rain comes back that I might find sudden instability if the brakes aren't releasing after slowing for a corner or that worse still I'm destined for total brake servo failure.
There are no ABS related error codes although in the ice and snow I did find that the ABS fired until the pedal raised stiff and all 4 wheels just locked up (that was a fun junction crossing).
I have noticed that the drainage ducts in the bulkhead are blocked but I've never had water enter the car so I don't think it's water in the brake servo although this could have happened prior to me owning it I guess.
Working theories:
Due to slave cylinder corrosion and calipers are releasing slowly
Due to brake servo fault - either water ingress of vacuum leak
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I am looking at a 2010 f150 4x4 lariat that shifts and drives great a thru all gears and down the highway. The truck makes a clunk whenever you start to move from a dead stop ? go about 5 feet and it runs great? my 07 fx4 has 247,000 miles and still doesn't make any noises, the 10 has 75,000 miles on it ford maintenance oil changes and trans flush, am going to have mech look at it, anyone think of possible items to zero in on? it has the 6 1/2 ft bed with 2 pc driveshaft ...
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After my 2010 Pri sets over night. When I get in the car I hear a loud clunk in the rear end that sounds like frozen brake drums breaking loose. What could this be?? Its summer in Ohio.
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Just recently got a 2011 Prius II and i love it. Only having one issue. Sometimes when i hit a bump with the windows open, i get a metallic clunking noise, but if i hit a bump immediately after it, I don't hear it again. Maybe 5 minutes or so later (not exact at all), If i hit another bump it will happen again. Seems to be on both sides of the car. Car has 5k miles so I'll be bringing in for service next week. Does this sound normal or is it something i need to have looked at?
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